9th class chemistry Chapter no.3 MCQs
Unit no.3 MCQS of 9th class Chemistry
Periodic Table and periodicity of properties :
1. Mendeleev’s periodic table was based upon the:
a. Atomic number
b. Electronic configuration
c. Completion of a subshell
d. Atomic mass
2. Long form of periodic table is constructed on the basis of:
a. Atomic mass
b. Mendeleev postulate
c. Mass number
d. Atomic number
3. 4th and 5th period of the long form of periodic table are called:
a. Long periods
b. Short periods
c. Very long periods
d. Normal periods
4. Transition elements are:
a. All non-metals
b. All gases
c. All metalloids
d. All metals
5. Which chemist presented triads?
a. Mendeleev
b. Dobereiner
c. Mosley
d. New lands
6. Which chemist discovered atomic number?
a. Bohr
b. Dalton
c. H. Mosley
d. Rutherford
7. The base of electronic configuration was:
a. Mass number
b. Ionization energy
c. Atomic number
d. Electron affinity
8. The horizontal rows of elements in the periodic table are called:
a. Blocks
b. Periods
c. Arrangement
d. Groups
9. The vertical columns in the periodic table are called
a. Blocks
b. Periods
c. Arrangements
d. Groups
10. The number of groups in the modern periodic tables is:
a. 12
b. 17
c. 8
d. 18
11. The number of periods in the modern periodic table is:
a. 7
b. 5
c. 8
d. 6
12. The first group elements of the periodic table are called:
a. Metalloids
b. Alkali metals
c. Halogens
d. Alkaline earth metals
13. Alkali metals belong to:
a. Third group
b. First group
c. Fourth group
d. Second group
14. The second group elements of the periodic table are called:
a. Halogens
b. Alkaline earth metals
c. Transition elements
d. Alkali metals
15. The number of elements in sixth period is:
a. 54
b. 18
c. 80
d. 32
16. How many blocks are there in modern periodic table?
a. Five
b. Three
c. Six
d. Four
17. The number of elements in third period is:
a. 8
b. 2
c. 18
d. 4
18. The seventeenth group elements of the periodic table are called:
a. Alkaline earth metals
b. Carbon family
c. Halogen
d. Noble gases
19. In which block of the periodic table do transition metals lie?
a. d
b. s
c. f
d. p
20. The number of elements in fourth period is:
a. 28
b. 8
c. 38
d. 18
21. The number of elements in first period is:
a. 18
b. 2
c. 32
d. 8
22. The number of elements in normal periods is:
a. 8
b. 18
c. 32
d. 10
23. The number of groups in modern periodic table is:
a. 14
b. 4
c. 18
d. 8
24. Lanthanides and actinides lie in:
a. d Block
b. s Block
c. f Block
d. p Block
25. The shortest period in the modern periodic table is:
a. 2nd
b. 4th
c. 1st
d. 3rd
26. The sixth and seventh period in the long form of periodic table are called:
a. Long periods
b. Short periods
c. Very long periods
d. Normal periods
27. The 1st period in modern periodic table is called:
a. Short period
b. Long period
c. Very long period
d. Normal period
28. The longest period in the modern periodic table is:
a. 6th
b. 3rd
c. 7th
d. 4th
29. The number of electrons in the valence shells of halogens is:
a. 7
b. 5
c. 8
d. 6
30. How many groups are there in long form of periodic table?
a. 12
b. 7
c. 18
d. 8
31. The blocks in modern periodic table are:
a. 4
b. 2
c. 5
d. 3
32. The extreme left side elements of the periodic table are called:
a. Halogen group
b. Alkali metals
c. Noble gases
d. Alkaline earth metals
33. The number of elements in the 6th period is
a. 22
b. 8
c. 32
d. 18
34. The base of long form of periodic table is:
a. Atomic mass
b. Mass number
c. Avogadro’s number
d. Atomic number
35. The number of elements in the first period of long form of periodic table:
a. four
b. Two
c. Five
d. Three
36. How many horizontal rows are there in long form of periodic table?
a. 7
b. 32
c. 18
d. 8
37. Which group in long form of periodic table is called group of noble gases?
a. 17
b. 15
c. 18
d. 16
38. Law of octaves was presented by:
a. Mendeleev
b. Newlands
c. Mosley
d. Dobereiner
39. Dobereiner belonged to:
a. England
b. France
c. America
d. Germany
40. The groups of three elements presented by Dobereiner are called:
a. Groups
b. Octaves
c. Periods
d. Triads
41. In triads, the atomic number of calcium is 40 and that of barium is 137 then the atomic number of strontium is:
a. 88
b. 75
c. 90
d. 56
42. Cannizzaro worked on atomic masses in
a. 1658
b. 1860
c. 1925
d. 1940
43. Newlands presented his law of octaves in:
a. 1864
b. 1855
c. 1870
d. 1859
44. In Newland’s octaves, the elements in each group were:
a. 11
b. 3
c. 15
d. 8
45. Mendeleev belonged to:
a. France
b. Germany
c. Afghanistan
d. Russia
46. The creator of first version of periodic table was:
a. Cannizzaro
b. Newlands
c. Mendeleev
d. Dobereiner
47. H. Moseley discovered the atomic number in.
a. 1913
b. 1906
c. 1915
d. 1910
48. The atomic number of an element is equal to its number of ………:
a. Isotopes
b. Electrons
c. None
d. Neutrons
49. The atomic number of an element is always:
a. Variable
b. Fixed
c. Both
d. None
50. Elements of the same periods show ……… properties:
a. Different
b. Same
c. None
d. Equal
51. The periodic table is divided into blocks depending upon:
a. Atomic number
b. Shells
c. Atomic mass
d. Sub shells
52. The number of electrons in the outermost shell of alkali metals is:
a. three
b. one
c. four
d. two
53. The number of electrons in the outermost shell of alkaline Earth metals is:
a. 3
b. 1
c. 4
d. 2
54. The number of electrons in the outermost shell of halogens is:
a. 7
b. 2
c. 6
d. 5
55. The number of electrons in the valence shell of noble gases is:
a. 6
b. 2
c. 8
d. 4
56. The total number of lanthanides is:
a. 14
b. 2
c. 18
d. 8
57. The elements having atomic numbers from 19 to 36 form:
a. Long periods
b. Short periods
c. Very long periods
d. Normal periods
58. The elements having atomic numbers from 55 to 86 form:
a. Long periods
b. Short periods
c. Very long periods
d. Normal periods
59. The amount of energy given out when an electron is added to an atom is called:
a. Electronegativity
b. Lattice energy
c. Electron affinity
d. Ionization energy
60. Which one of the following halogen has lowest electronegativity?
a. Bromine
b. Fluorine
c. Iodine
d. Chlorine
61. Along the period, which one of the following decreases:
a. Electron affinity
b. Atomic radius
c. Electronegativity
d. Ionization energy
62. Point out the incorrect statement about electron affinity:
a. it is gradually decreased in a period
b. energy is released
c. it is measured in kJmol-1
d. it is gradually decreased in a group
63. Ionization energy of sodium is:
a. 419 kJmol-1
b. 377 kJmol-1
c. 496 kJmol-1
d. 403 kJmol-1
64. Which of the following is a period in which ……… is decreased from left to right?
a. Electron affinity
b. Atomic radius
c. Electro negativity
d. Ionization energy
65. Electro negativity of fluorine is:
a. 3.2
b. 4.0
c. 3.0
d. 3.4
66. Which of the following halogen has the greatest value of electro negativity?
a. Bromine
b. Chlorine
c. Iodine
d. Fluorine
67. Electro negativity of chlorine is:
a. 3.3
b. 3.1
c. 3.4
d. 3.2
68. Atomic radius of carbon is:
a. 87pm
b. 67pm
c. 97pm
d. 77pm
69. Reason of increasing ionization energy in a period is:
a. Increasing the number of electrons
b. Decreasing the numbers of shell
c. increasing the number of shells
d. increasing the force of attraction between valence shell electron and nucleus
70. . Point out the right statement about electron affinity:
a. Decreases in period
b. Measurement in kilo joule per mole
c. Absorbs energy
d. Increases in group
71. The atomic radius ……… in a period from left to right:
a. Remains constant
b. Increases
c. Decreases
d. None
72. The atomic radius ……… in a group from top to bottom:
a. Remains constant
b. Increases
c. Decreases
d. None
73. The shielding effect ……… in a period from left to right:
a. Remains constant
b. Increases
c. Decreases
d. None
74. The shielding effect ……… in a group from top to bottom:
a. Remains constant
b. Increases
c. Decreases
d. None
75. The electron affinity ……… in a period from left to right
a. Remains constant
b. Increases
c. Decreases
d. None
76. The electron affinity ……… in a group from top to bottom:
a. Remains constant
b. Increases
c. Decreases
d. None
77. The ionization energy ……… in a period from left to right:
a. Remains constant
b. Increases
c. Decreases
d. None
78. The ionization energy ……… in a group from top to bottom
a. Remains constant
b. Increases
c. Decreases
d. None
79. The electro negativity ……… in a period from left to right:
a. Remains constant
b. Increases
c. Decreases
d. None
80. The electro negativity ……… in a group from top to bottom:
a. Remains constant
b. Increases
c. Decreases
d. None
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